| Grønfjelldalen | |
| Map: | Nordland#Norway |
| Label Position: | top |
| Coordinates: | 66.3514°N 14.6336°W |
| Location: | Nordland, Norway |
| Type: | River valley |
Grønfjelldalen is a valley in the municipality of Rana in Nordland county, Norway. It is a side valley off of the main Dunderland Valley. The river Grønfjellåga runs from the lake Kallvatnet down through the valley, flowing into the main river Ranelva near Grønnfjelldal Station.[1]